IGS Router Password Recovery

Have a IGS Router that hasn’t been used in a few years. Can login but nobody knows the enable password. Have linked to router with V220 terminal and a PC with Hyperterminal on a rollover cable linking the com ports. In both cases cannot get the router to respond to break key as per password recovery instructions from Cisco. Have tried alternate procedures of changing the emulation setting and using the space bar as a break key. Dead in the water. Anybody have a workable suggestion.